.themeTab:hover .themeBox {
    opacity: 1;
    transition: 0.5s;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    top: 90px;

    border: 1px solid #737373;
    visibility: visible;

    
  }

  /* 主题盒子 */
  .themeBox {
    position: absolute;
    top: 50px;
    width: 100%;
   
    padding-bottom: 10px;
    visibility: hidden;

    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;

    background-color: white;
    color: #737373;
    border: 1px solid #737373;
    z-index: 1;

    opacity: 0;
    transition: 0.5s;
  }
  /* 主题下面的各项 */
  .themeBox div {
    height: 70px;
    padding: 0;
    border-bottom: 1px solid #737373;
  }
  .themeBox div:hover {
    height: 70px;
    color: #0f9cf5;
  }